How would you approach this repair?

[Stanios]

Hi, access is good here, from my experience retrofitting connections to stack at high level (inaccessible via ladder) is just a bad idea.
Would the only reliable way be to fit a boss socket? Leave the tee in or go in the wall and put a new tee in?
(leak is on the 1 1/2" connection to 4")

Cheers!

 

[ShaunCorbs]

Mcalpine compression boss if you can and replace the tee your fixed at two points so no wiggle you could try and remove the tee eg leave the 11/2 in the wall and re glue a new tee with access on etc

 

[Ben-gee]

Cut the 1 1/2” on the red line - leaves enough to get a fitting on.
Cut the 4” on the yellow line and remove 4” down to the black coupler.
Replace 4” from coupler with a boss pipe then plain pipe and finish off with a slip coupled to existing.
Then bring the 1 1/2” down to the new boss pipe.